Did some quick research out of interest. Melamine and porcelain steel seems to be the most common. References: http://mywhiteboards.blogspot.se/2012/06/melam

Did some quick research out of interest. Melamine and porcelain steel seems to be the most common. References: http://mywhiteboards.blogspot.se/2012/06/melamine-vs-porcelain-steel.html http://mywhiteboards.blogspot.se/2012/06/melamine-vs-porcela... http://www.whiteboardsetc.com/laminated_panel.htm http://www.whiteboardsetc.com/laminated_panel.htm http://dryeraseboard.com/aluminum-trim-porcelain-steel-markerboards.html http://dryeraseboard.com/aluminum-trim-porcelain-steel-marke... http://www.usmarkerboard.com/s/Unframed-Whiteboard-Material/13 http://www.usmarkerboard.com/s/Unframed-Whiteboard-Material/...